bacteroid

noun
bac·​te·​roid | \ˈbak-tə-ˌrȯid \

Definition of bacteroid 

: an irregularly shaped form of a nitrogen-fixing bacterium (such as a rhizobium) found especially in root nodules of legumes

First Known Use of bacteroid

1878, in the meaning defined above

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The first known use of bacteroid was in 1878

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